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Abstract:

A fastener for fixing a heat sink on an electronic component is
disclosed. The fastener includes a frame seat, a latch and two
depressors. The frame seat is formed with a hollow for accommodating the
heat sink and the latch is moveably mounted on the frame seat. The
depressors may be selectively pressed or released by the latch against
the frame seat. The heat sink can be fastened by the depressors when the
depressors are pressed by the latch.

Claims:

1. A heat sink fastener comprising: a frame seat having a hollow for
accommodating a heat sink; a latch movably rotatably assembled on the
frame seat; and a depressor; wherein the latch is capable of pressing and
releasing the depressor between the frame seat and the depressor, and the
depressor exerts pressure on the heat sink when the latch presses the
depressor.

2. The heat sink fastener of claim 1, wherein the frame seat is provided
with a plurality of fixing holes separately passed by flexible fixers.

3. The heat sink fastener of claim 1, wherein the frame seat is provided
with a nut post, the latch is provided with a fixing hole corresponding
to the nut post, and a bolt passes through the fixing hole to screw into
the nut post when the latch is pressing the depressor.

4. The heat sink fastener of claim 1, wherein the latch is of a U shape.

5. The heat sink fastener of claim 4, wherein two ends of the U-shaped
latch are separately formed with two pressing portions pressing the
depressor.

6. The heat sink fastener of claim 4, wherein two ends of the U-shaped
latch are separately formed with two protrusions, the frame seat is
formed with two opposite side walls on two edges of the hollow, each of
the side walls is provided with a receiving hole for receiving the
protrusions.

7. The heat sink fastener of claim 6, wherein each of the protrusions is
further extended with a protrudent hook.

8. The heat sink fastener of claim 6, wherein an upper edge of the
receiving hole is formed with a progressively rising slant.

9. The heat sink fastener of claim 1, wherein the depressor is a zigzag
plate.

10. The heat sink fastener of claim 9, wherein the zigzag depressor
includes an upper pressed section and a lower pressing section, the
pressed section is pressed by the latch, and the pressing section
overlaps the heat sink.

11. The heat sink fastener of claim 9, wherein the pressed section is
further extended with a connecting section having a connecting hole, the
frame seat is provided with a connecting sheet inserted into the
connecting hole.

12. The heat sink fastener of claim 9, wherein the depressor is provided
with a threaded hole for being fixed on the heat sink.

Description:

BACKGROUND OF THE INVENTION

[0001] 1. Technical Field

[0002] The invention relates to heat sinks, particularly to fasteners for
fixing a heat sink on an electronic device.

[0003] 2. Related Art

[0004] With the advancement of semiconductor technology, electronic
components such as the CPUs run with higher and higher frequency. Thus
heat sinks for electronic components have become indispensible. A heat
sink must be firmly mounted on an electronic component by a fastener.
Such a fastener must be easy to be installed and detached.

[0005] Taiwan patent No. 505267 discloses a typical heat sink fastener. TW
'267 employs a lever to install or detach the heat sink, but the lever is
in direct contact with the heat sink. However, some heat sinks may be
improper for being directly depressed because direct depression may cause
damage, deformation or instability.

SUMMARY OF THE INVENTION

[0006] An object of the invention is to provide a heat sink fastener which
may prevent the heat sink from being damaged by means of indirect
depression.

[0007] To accomplish the above object, the fastener of the invention
includes a frame seat, a latch and two depressors. The frame seat is
formed with a hollow for accommodating the heat sink and the latch is
moveably mounted on the frame seat. The depressors may be selectively
pressed or released by the latch against the frame seat. The heat sink
can be fastened by the depressors when the depressors are pressed by the
latch.

[0009]FIG. 2 is a schematic view showing the invention and a circuit
board;

[0010]FIG. 3 is a side plan view of the invention when the latch is
released;

[0011]FIG. 4 is a side plan view of the invention when the latch is being
locked;

[0012]FIG. 5 is a side plan view of the invention when the latch has been
locked; and

[0013]FIG. 6 is a cross-sectional view of the invention mounted on a
circuit board.

DETAILED DESCRIPTION OF THE INVENTION

[0014] Please refer to FIGS. 1 and 2. The invention provides a fastener
for fixing a heat sink 2 onto an electronic component 30 on a circuit
board 3. The fastener 1 includes a frame seat 10, a latch 11 and two
depressors 12.

[0015] The frame seat 10 is formed with a hollow 100 for accommodating the
heat sink 2. The heat sink 2 includes a base 20 and a fin set 21 thereon.
When the heat sink 2 is placed in the hollow 100 of the frame seat 10,
the base 20 of the heat sink 2 may be in contact with the electronic
component 30. The frame seat 10 is provided with a plurality of fixing
holes 101 for being fixed on the circuit board 3 by a flexible fixer 31
as shown in FIG. 6.

[0016] The latch 11 is moveably mounted on the frame seat 10 to depress or
release the depressors 12. Please refer to FIGS. 3-5. The latch 11 may be
rotated to press the depressors 12 when the heat sink 2 has not been
fixed on the electronic component 30 yet. Then the heat sink 2 can be
fastened on the electronic component 30 by the depressors 12 because the
depressors 12 are pressed by the latch 11.

[0017] Please refer back to FIGS. 1 and 2. In the shown embodiment, the
latch 11 is formed into a U shape. Two ends of the U-shaped latch 11 are
separately formed with two protrusions 110 corresponding to two opposite
side walls 102 of the frame seat 10. Each of the side walls 102 is
provided with a receiving hole 103 for receiving the protrusions 110. The
protrusions 110 are unfixedly inserted into the receiving holes 103 when
the latch 11 is perpendicular to the frame seat 10 as shown in FIG. 3.
The protrusion 110 is further extended with a hook 111 which can prevent
the protrusion 110 from escaping the receiving hole 103 when the latch 11
exerts pressure between the frame seat 10 and depressors 12 as shown in
FIG. 5. Furthermore, an upper edge of the receiving hole 103 is formed
with a slant 104 for guiding the protrusion 110 to lean against one side
of the receiving hole 103. Besides, two ends of the latch 11 are further
separately formed with two pressing portions 112.

[0018] The depressors 12 are pressed by the latch 11 to exert pressure
onto the heat sink 2. In other words, the heat sink 2 is not directly
pressed by the latch 11 to avoid damage. In the shown embodiment, each of
the depressors 12 is formed into a zigzag plate including an upper
pressed section 120 and a lower pressing section 121. The pressed section
120 is pressed by the pressing portion 112 of the latch 11 and the
pressing section 121 overlaps the base 20 of the heat sink 2 as shown in
FIG. 6. The zigzag shape of the depressor 12 may provide an effect of
buffer to reduce damage to the heat sink 2. The pressed section 120 may
be further extended with a connecting section 122 having a connecting
hole 123. The frame seat 10 is provided with a connecting sheet 105
inserted into the connecting hole 123. The connecting hole 123 is larger
than the connecting sheet 105 in size, so the connecting hole 123 may be
movably inserted by the connecting sheet 105. This can provide a
positioning effect between the depressor 12 and the frame seat 10.

[0019] The pressing section 121 of the depressor 12 is provided with at
least one threaded hole 124 and the base 20 is provided with at least one
through hole 200 corresponding to the threaded hole 124. A bolt 201 may
pass through the through hole 200 to screw into the threaded hole 124 for
fastening the depressor 12 on the heat sink 2. As shown in FIG. 5, the
frame seat 10 is provided with a nut post 106 and the latch 11 is
provided with a fixing hole 113 corresponding to the nut post 106.
Another bolt 114 may pass through the fixing hole 113 to screw into the
nut post 106 for fastening the latch 11 on the frame seat 10.

[0020] While the forgoing is directed to a preferred embodiment of the
present invention, other and further embodiments of the invention may be
devised without departing from the basic scope thereof. As such, the
appropriate scope of the invention is to be determined according to the
claims.